Dim Sum. There are so many varieties to choose from. These are little one (or two) bite treats that are impossible to make at home.
Peking Duck is another one of those 'impossible to make at home' dishes that are really good. It is a roasted duck dish is prized for the thin, crisp skin, with authentic versions of the dish serving mostly the skin and little meat, sliced in front of the diners by the cook. It is often served in a bun with some green onions and a little (sweet) plum sauce. Delicious.
Once in a while I will treat myself to the delicious heart attack in a cup known as 东坡肉 (Dong Po Rou), which is basically just a blob of incredibly oily, greasy, fatty pork belly with rind the size of a fist, stewing in its own juices and fermented wine. It's mouth-wateringly tasty and literally melts on your tongue. Done right, you should get about a centimetre of meat for every 2cms of fat. Don't judge it from appearance. It's soooooooo good ...
Be careful not to eat too much though or you'll end up with a little dong po belly of your own. Like me.